End-of-Year Practice Paper: Chapters 1–8 — mark scheme (print)

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Secondary 1 · Lower Secondary Science (G2 / G3)

Mark scheme

Chapters 1–8

End-of-Year Practice Paper · Maximum mark: 60

Notes for markers

Award one mark for each point marked [1], up to the marks shown for the part.
Accept answers worded differently that show the same understanding.
Units are required where the answer line shows one. ecf: allow an error carried forward.

Section A: Multiple-choice questions[20 marks]

Question	Answer
1	BWith the air hole closed, burning is incomplete: the flame is yellow and sooty.	1
2	DThe metre is the SI unit; the others are multiples or fractions of it.	1
3	CThe type of plant must be the same in every set-up for the test to be fair.	1
4	DOnly aluminium is denser than water.	1
5	ALight passes through transparent glass.	1
6	CWater is made of hydrogen and oxygen chemically combined.	1
7	BSea water contains water, salt and other substances that are not chemically combined.	1
8	CMetals conduct electricity well; they are usually shiny and can be hammered into shape.	1
9	BDistillation boils off the water and condenses it, leaving the dissolved salt behind.	1
10	ASand is insoluble, so it is trapped by the filter paper.	1
11	DEach spot is a different dye that travelled a different distance.	1
12	BThe angle of reflection equals the angle of incidence.	1
13	ALight slows down in glass, so the ray bends towards the normal.	1
14	CPlant cells have a cell wall (and chloroplasts); animal cells do not.	1
15	AThe nucleus contains genetic material and controls the cell’s activities.	1
16	DCells form tissues, tissues form organs, and organs work together in systems.	1
17	CGas particles are far apart and move quickly in all directions.	1
18	DPerfume particles spread out from where they are concentrated — diffusion.	1
19	BCarbon dioxide is CO₂: one carbon atom joined to two oxygen atoms.	1
20	CElectrons are negative, protons are positive and neutrons have no charge.	1

Section B: Structured questions[40 marks]

Question	Answer and marking points	Marks
1(a)	Independent: the temperature of the water. Dependent: the time taken for the sugar to dissolve. Independent: temperature of water [1] Dependent: time taken to dissolve [1]	2
1(b)	The result at 50 °C (88 s). She should repeat the measurement at 50 °C and leave the anomalous value out when describing the pattern. 88 s / the 50 °C result [1] Repeat it / leave it out of the pattern or average [1]	2
1(c)	As the temperature increases, the time taken decreases (the sugar dissolves faster). Time decreases as temperature increases [1]	1
1(d)	Any one: the mass of sugar; the volume of water; the amount of stirring; the grain size of the sugar. Any valid controlled variable [1]	1
	Total for Question 1	6
2(a)	88.8 − 52.0 = 36.8 g [1]	1
2(b)	Density = mass ÷ volume = 36.8 ÷ 40.0 = 0.92 g/cm³ Uses density = mass ÷ volume (36.8 ÷ 40.0) [1] 0.92 g/cm³ [1] Allow error carried forward from (a).	2
2(c)	The oil forms the top layer, because it is less dense than water. Oil [1] Oil has a lower density than water [1]	2
	Total for Question 2	5
3(a)	Iron: element. Water: compound. Air: mixture. Iron — element [1] Water — compound [1] Air — mixture [1]	3
3(b)	In a compound the elements are chemically combined in a fixed proportion and can only be separated by chemical reactions; in a mixture the substances are not chemically combined, can be in any proportion, and can be separated by physical methods. Chemically combined (compound) vs not chemically combined (mixture) [1] Fixed proportion vs any proportion, or chemical vs physical separation [1]	2
	Total for Question 3	5
4(a)	Use a magnet to remove the iron filings. Add water to the rest and stir, so the salt dissolves. Filter: the sand stays on the filter paper. Rinse the sand with a little water and leave it to dry. Heat the filtrate (salt solution) in an evaporating dish to evaporate the water and leave the salt. Magnet removes the iron filings [1] Add water and stir to dissolve the salt [1] Filter to separate the sand [1] Dry the sand (e.g. between filter papers / leave to dry) [1] Evaporate the filtrate to obtain the salt [1]	5
4(b)	Residue: sand. Filtrate: salt solution. Residue: sand [1] Filtrate: salt solution / salt water [1]	2
	Total for Question 4	7
5(a)	The angle of incidence is equal to the angle of reflection. Angle of incidence = angle of reflection [1]	1
5(b)	Angle of incidence = 90° − 35° = 55°. Angle of reflection = 55°. Angle of incidence 55° (measured from the normal) [1] Angle of reflection 55° [1] A common error is to give 35°: angles are measured from the normal, not the mirror.	2
5(c)	The ray bends towards the normal, because light travels more slowly in water than in air. Bends towards the normal [1] Light slows down in water [1]	2
5(d)	A straw looks bent in a glass of water; a swimming pool looks shallower than it is. Any valid example [1]	1
	Total for Question 5	6
6(a)	Any two: nucleus; cell membrane; cytoplasm. First structure [1] Second structure [1]	2
6(b)	Cell wall — gives the cell a fixed shape and support; or chloroplast — where photosynthesis takes place; or large central vacuole — stores cell sap. Correct structure [1] Matching function [1]	2
6(c)	They receive no light underground, so they cannot carry out photosynthesis; chloroplasts would have no use. No light reaches them [1] So no photosynthesis takes place there [1]	2
	Total for Question 6	6
7(a)	In a solid the particles are closely packed in a regular pattern. In a gas they are far apart and arranged randomly. Solid: closely packed, regular arrangement [1] Gas: far apart, random arrangement [1]	2
7(b)	There are large spaces between the particles of a gas, so they can be pushed closer together. Large spaces between gas particles [1]	1
7(c)	A compound, because it contains two different elements chemically combined. Compound [1] Two different elements chemically combined [1]	2
	Total for Question 7	5

— End of mark scheme —